23 results about "Design flood" patented technology

The invention relates to a mountain river flood dynamic rehearsal method, device and equipment based on big data fusion and a medium. The method comprises the following steps: acquiring a multi-source fusion data set of a target mountain river; based on the multi-source fusion data set, recognizing the flood type of the target mountain river in combination with a preset threshold rule to obtain the flood type and cause parameters; according to the flood type and the cause parameter, calculating a design flood peak flow value of each node in the target mountain river; according to each design flood peak flow value, performing section-by-section trial calculation through an energy equation to obtain a design flood surface line; and performing dynamic simulation processing on the flood routing process of the target mountain river based on the designed flood water surface line, and generating a flood routing dynamic simulation report of the target mountain river. The method can accurately adapt to the characteristics of diverse causes and complex propagation process of flood in a mountain river, and remarkably improves the refinement degree and reliability of flood rehearsal.

The application provides a built hydropower station operation water level lifting method based on staged design flood, comprising: analyzing flood seasonal variation law of a target hydropower station reservoir, carrying out flood staging on the target hydropower station reservoir flood, and proposing design flood and design flood hydrograph of different periods; constructing a hydropower station reservoir area water surface line calculation model, combining the design flood of the target hydropower station reservoir to calculate the reservoir water surface line under each starting push water level of different periods; constructing a hydropower station flood regulation model, combining the design flood hydrograph of the target hydropower station reservoir to calculate the reservoir highest flood regulation water level under each starting regulation water level of different periods; based on the reservoir water surface line and the highest flood regulation water level, combing the water level lifting opportunity, the water level lifting scheme is drafted. Through the application, the problem that the existing related technology cannot fully tap the comprehensive benefits of the project is solved.

The invention relates to the crossing field of water conservancy projects and computer simulation technologies, in particular to a river and canal protection engineering failure dynamic judgment and boundary updating method, which comprises the following steps of: marking a protection engineering area and setting the protection engineering area as a non-scour boundary during simulation initialization, and calculating hydrodynamic parameters such as water depth and flow velocity in each time step; comparing with the water depth-flow velocity relationship of a gabion, the design flood control standard of a stilling pool, the bottom elevation of an anti-scour wall and other anti-scour thresholds, if the thresholds are exceeded, judging that the boundary is invalid and dynamically updating the boundary to be a scoured boundary, and continuing simulation by combining dynamic dry and wet grid judgment and GPU parallel calculation; according to the method, water flow-sediment-riverbed-protection engineering collaborative simulation is achieved, the progressive damage process is precisely restored, the erosion and deposition simulation error is lower than 9%, universality is high, and a reliable quantification tool is provided for flood control safety evaluation and optimization design of wading projects such as river and canal crossing engineering.

This invention relates to a method for estimating design floods using coupled GAMLSS and BMA models under changing environments, and pertains to the field of hydrological response and its impact assessment technology. The invention first quantitatively identifies changes in meteorological and hydrological elements under future changing environments, and then performs inconsistency frequency analysis based on their distribution characteristics and variation patterns. Then, based on the inconsistency frequency analysis results obtained from different global climate models, it integrates design flood data using the BMA model. This effectively avoids the problem of homogenization in the ensemble simulation results caused by the uncertainty of input data when directly applying the BMA method to runoff sequences, which leads to significant deviations in the design flood analysis results. This invention solves the uncertainty and inconsistency problems faced by current conventional methods.

The invention provides a reservoir spillway flood regulation calculation method and device and electronic equipment, and the method comprises the steps: firstly selecting a reservoir original design flood hydrograph of a frequency corresponding to a target standard, then selecting a gate control working condition of a reservoir spillway, and carrying out the regulation calculation of the flood of the reservoir spillway based on the reservoir original design flood hydrograph and a reservoir original discharge capacity curve; and determining a reservoir design flood hydrograph and a reservoir discharge capacity curve corresponding to the gate control working condition, and then performing flood regulation calculation by adopting a water balance method based on the gate control working condition, the reservoir design flood hydrograph, the reservoir discharge capacity curve, the normal storage level of the reservoir and the water level storage capacity curve of the reservoir to obtain a reservoir flood regulation hydrograph. By adopting the method, the efficiency and the accuracy of reservoir flood regulation calculation can be improved, so that the working efficiency of reservoir project spillway type comparison and selection can be improved.

The invention relates to the technical field of regional synthesis, and discloses a multi-landform parameter empirical formula regional synthesis method, system and device and a medium, and the method comprises the steps: obtaining the basic information of hydrological sites of a research region, and constructing a regional result table according to the basic information of the hydrological sites; using a preset empirical formula general equation to construct a general equation set corresponding to the regional result table; generating a target general equation of the research area according to the general equation set; obtaining landform influence parameters of an actual area, and constructing a landform parameter feature combination of the landform influence parameters; and calculating a formula parameter fitting degree of the landform parameter feature combination by using the target general formula, and determining a regional comprehensive empirical formula according to the formula parameter fitting degree. According to the method, quantitative expression of the specific actual region flood peak flow and various landform parameter characteristics can be achieved, and accurate and effective design flood calculation is achieved.

This application discloses a method and device for calculating the flood discharge cross-section of cross-river bridges, belonging to the field of intelligent bridge design technology. It includes: converting bridge data into a processable data structure for standardized bridge data; and ensuring the consistency of mathematical representations of core parameters such as flood level, riverbed, and piers by establishing a unified spatial coordinate benchmark and data structure mapping rules. The method employs a dual-cutting operation on the riverbed line and pier outline using the design flood level line. By introducing a secondary cutting operation on the underwater pier outline using the riverbed line, a dynamic determination mechanism for the flood-resistant pier outline is constructed, fully coupling the spatial interaction between natural riverbed morphology and artificial structures. This ensures that the calculation results simultaneously meet the flood discharge safety standards of the water conservancy industry and the structural design requirements of bridge engineering, providing high-confidence technical support for the planning, design, and flood control assessment of cross-river bridges.

The invention discloses a reservoir group flood resource utilization chain risk analysis method, which comprises the steps of fitting error probability distribution based on weather rain-free forecast data, and generating a water recession section flow probability forecast scene set; inputting a recession section flow probability forecasting scene set, and determining a reservoir regulation starting water level probability sample by adopting a dynamic allocation method considering flood space distribution and a real-time state; based on historical flood data, a graph neural network is adopted to learn reservoir group topological correlation features to optimize a spectral clustering process, and a neural gas algorithm is utilized to generate a design flood hydrograph scene; a whole-process flood control chained risk decision-making tree is constructed by fusing a scheduling starting water level probability sample and a design flood hygrograph scene, and a double-threshold risk early warning mechanism based on CVaR and VRR is established through full-path scheduling simulation and risk contribution degree backtracking analysis. According to the invention, multi-source uncertain chained coupling is realized, and the accuracy of risk assessment and the reliability of decision making are improved.

This invention discloses a method for estimating long-duration design tidal process lines, comprising: preprocessing and frequency analysis of historical tidal data to obtain the design high tide level, design flood tide range, and design ebb tide range; selecting a typical long-duration tidal process containing the highest tide level, and selecting a "one flood, one ebb" process at a later position as the main tidal type according to the principle of "high tide level - long duration - later high tide level", with the rest being secondary tidal types; using the design high tide level, design flood tide range, and design ebb tide range to perform same-frequency combination design on the main tidal type to obtain the design main tidal type process; using the scaling ratio of the corresponding phase points of the design main tidal type and the measured main tidal type as a benchmark, scaling the secondary tidal types accordingly to obtain the design secondary tidal type processes; and splicing the results to obtain the complete long-duration design tidal process. This invention overcomes the limitation of existing methods that can only deduce "one flood, one ebb" processes and is applicable to the calculation of any long-duration design tidal process.

The invention discloses a probability design flood deduction method and system based on parameter and form uncertainty. The method comprises the steps of determining distribution parameter uncertainty of flood frequency analysis and process line form uncertainty of design flood process line dynamic synthesis; constructing a Monte Carlo simulation framework; monte Carlo simulation circulation is carried out based on a Monte Carlo simulation framework, combined sampling is carried out on the distribution parameters and the dynamic weight vector expressing the form uncertainty of the hydrograph in each Monte Carlo simulation circulation, complete calculation from design flood peak flow deduction to design flood hydrograph dynamic synthesis is carried out, and the design flood hydrograph is obtained. Generating a design flood hydrograph; and aggregating all the design flood hydrographs generated by the Monte Carlo simulation cycle to obtain a probabilistic result for flood control design. According to the method, the design flood inference is converted from certainty to probability, the result reliability can be systematically evaluated, and a scientific basis is provided for risk-based flood control decisions.

The invention discloses an evaluation method for quantifying the influence of land subsidence on dike design standards. According to the method, multi-source data such as hydro meteorology, terrain and land subsidence monitoring are fused, and a hydrological-hydrodynamic coupling model is driven to simulate river channel design flood levels in different design return periods; selecting a typical section, and quantitatively calculating the space cumulative effect of land subsidence and the relative reduction value of the levee crest elevation caused by the space cumulative effect; and a three-dimensional response relation model of design flood level-settling volume-standard adjustment amplitude is constructed, and the reduction degree of the flood control design standard is accurately quantified. According to the method, the simplification limitation of a traditional linear superposition method is broken through, quantitative correlation between the land subsidence and the flood control design standard downshift amplitude is achieved, and an integrated evaluation process of land subsidence, design standard adjustment and engineering coping strategies is established; scientific basis and technical support are provided for embankment design standard review, safety evaluation and flood control and disaster reduction decision making.

This invention discloses a method for determining the dynamic flood control limit water level of a reservoir. The method first uses cluster analysis to segment the reservoir's flood season. Then, it uses the original design flood control limit water level as the lower limit of dynamic control, the flood control limit water level determined according to the phased design floods as the suggested lower limit of dynamic control, the flood control limit water level determined considering pre-release as the upper limit of dynamic control, and the flood control limit water level determined considering the uncertainties of pre-release and flood forecast as the suggested upper limit of dynamic control. Finally, it determines the dynamic control range of the flood control limit water level. When determining the dynamic flood control limit water level and pre-release value, an integer variable is introduced to express the existing flood control scheduling rules of the reservoir as constraints to establish a pre-release optimization model. The method for determining the dynamic flood control limit water level of a reservoir provided by this invention improves the scientificity and operability of dynamic water level control during the flood season, and can be applied to the refined management of reservoir flood control, improving the power generation and comprehensive utilization benefits of the reservoir.

The invention provides a method, a system, equipment and a medium for calculating design flood of a small watershed in a mountainous area, designs a simple method for solving the problem that the peak flood flow of a downstream section is smaller than that of an upstream section in design flood calculation of the small watershed in the mountainous area, and is extremely suitable for the small watershed in the mountainous area with steep upstream, gentle downstream and less than 100km < 2 > in rainwater collection area. When the design flood is calculated, the abnormal phenomenon that the peak discharge of the downstream section is smaller than that of the upstream section occurs, the peak discharge of the downstream section can be deduced through the method, the evolution rule of the flood from the upstream to the downstream is truly reflected, and therefore the design flood can be calculated more scientifically; scientific and reliable basis is provided for flood control design of water conservancy projects, the construction scale of newly-built reservoirs or river regulation projects is reasonably determined, the project safety and reliability are greatly improved, and therefore economic losses are reduced or even avoided.

This invention relates to the field of watershed design flood technology, and more particularly to a method for estimating watershed design floods based on a conceptual hydrological model. The method includes the following steps: spatially dividing the watershed according to the underlying surface type and elevation distribution characteristics to form slope zones and channel zones, and determining the water transfer sequence between each zone to establish the zoned hydrological structure of the conceptual hydrological model; based on the zoned hydrological structure, extracting historical flood events and identifying the critical humidity conditions for the transition from water storage to runoff generation in each zone; mapping the critical humidity conditions to zoned runoff generation parameters and integrating them to form a baseline parameter structure; extracting the temporal structure characteristics of design storms in the watershed and calculating their structural similarity to historical flood events; this invention, through the estimation of watershed design floods, enables accurate calculation of the watershed design flood hydrograph and reliable extraction of the design flood peak value, thereby improving the accuracy of design flood simulation and the reliability of flood control projects.

The application provides a global arbitrary position small watershed design flood rapid calculation method, relates to the technical field of hydrology and water resources technology, defines a to-be-calculated design flood region as a target point, obtains watershed characteristic parameters, rainstorm statistical parameters and runoff yield statistical parameters of the target point, combines a reasoning formula of a target watershed, and calculates each frequency design flood of the small watershed; the obtaining process of the watershed characteristic parameters comprises the following steps: generating a target region water system and a watershed boundary vector data set based on DEM data, obtaining a watershed boundary above the target point according to the target region water system and the watershed boundary vector data set, and obtaining the watershed characteristic parameters through the watershed boundary above the target point. The application realizes the extraction of the watershed boundary above a global arbitrary section point by establishing spatial indexes on the basis of a global sub-watershed boundary data set and a global water system data set, and greatly improves the flood analysis efficiency.

The invention provides a rainstorm flood characteristic analysis and design flood calculation method for a region lacking data, and the method comprises the following steps: analyzing the topographic geology, hydrological conditions, river systems and other natural conditions of the region lacking data, and mastering the basic environment characteristics of the region; carrying out rainstorm characteristic analysis and flood characteristic analysis, including flood, flood encountering, flood composition and the like over the years; and constructing a flood control foundation and integrally designing flood. Basic information is prepared, flood control standards are determined, flood control station overall design flood work is carried out, and the flood control station overall design flood work comprises calculation of flood control station overall design flood through a peak and W24h flood volume same-frequency amplification method and typical flood selection and design flood amplification; and flood calculation is designed in each link. And performing branch design flood and reservoir dam site design flood calculation, and completing the whole process work of design flood calculation in combination with the requirements of the basin general situation, the reservoir design flood and the like. Research results have important practical significance for guaranteeing flood control safety of cities and towns along the mountain river.

This invention discloses a chain-based risk analysis method for flood resource utilization in reservoir groups, comprising: fitting an error probability distribution based on meteorological no-rain forecast data to generate a set of probability forecast scenarios for the receding water level; inputting the set of probability forecast scenarios for the receding water level and employing a dynamic allocation method considering the spatial distribution and real-time status of floods to determine the probability samples of the reservoir's initial regulation water level; using graph neural networks to learn the topological association features of the reservoir group based on historical flood data to optimize the spectral clustering process, and using a neural gas algorithm to generate a design flood hydrograph scenario; fusing the probability samples of the initial regulation water level and the design flood hydrograph scenario to construct a chain-based risk decision tree for the entire flood control process; and establishing a dual-threshold risk early warning mechanism based on CVaR and VRR through full-path scheduling simulation and risk contribution backtracking analysis. This invention achieves chain-based coupling of multi-source uncertainties, improving the accuracy of risk assessment and the reliability of decision-making.

The invention provides a plain river network area flood drainage project design scale determination method and device, and the method comprises the steps: firstly generating a design flood process line and a design tide level process line of a plain river network area based on the tide level observation data and rainstorm data of the plain river network area over the years; then, based on the underwater topographic data of the plain river network area regulation and storage water body, establishing a corresponding relation between the water level and the volume of the plain river network area regulation and storage water body; determining the highest flooding control water level of the plain river network area based on the planning information and the topographic information of the plain river network area; and finally determining the design scale of the flood drainage project of the plain river network area based on the designed flood hydrograph, the designed tide level hydrograph, the corresponding relation, the highest flood control water level and the parameter information of the flood drainage project of the plain river network area. By adopting the method, the rationality of the plain river network area drainage engineering design can be effectively improved.

The invention discloses an overall flood classification method and system based on flood composition and encountering conditions, and the method comprises the steps: S1, collecting and sorting the overall flood data of a research section, including the flood process of a research section session and the inflow process of an upstream main inflow section at a corresponding time; s2, calculating the flood volume ratio of inflow water of upstream main inflow water sections of different overall floods to downstream floods in different time periods; s3, calculating the average proportion of incoming water of the upstream main incoming water section of each overall flood to the flood volume of the downstream flood in different time periods; s4, primarily classifying the floods according to the average proportion of inflow of upstream main inflow sections of different overall floods to the flood volume of downstream floods in different time periods; s5, flood encounter evaluation indexes are defined, secondary classification is conducted on the overall flood according to the evaluation indexes, and refined classification of the overall flood is achieved; according to the method, the overall flood is classified, the upstream and downstream overall flood can be quantitatively and finely classified, and a basic support is provided for researches such as overall design flood and similar flood recognition.

This invention discloses a design flood correction method coupling climate trends and extreme events, belonging to the field of next-generation information technology. The method includes the following steps: initiating a non-stationary analysis mechanism through a three-dimensional metric for climate change significance; constructing a shifted enhanced flood dataset based on watershed similarity screening and function shifting; employing a Bayesian framework to comprehensively utilize watershed information and shifted information to construct a main non-stationary flood correction model considering climate trends, and a tail-end extreme flood correction model; finally, outputting the complete posterior distribution of flood design values ​​through dynamic coupling of the main and tail aspects, thus achieving design flood correction coupling climate trends and extreme events. This invention improves the robustness and engineering applicability of long-return-period flood design results, providing solid scientific support for the correction of watershed flood control standards and the safety assessment of major water-related projects under changing environments.

The invention discloses a small watershed design flood reckoning method based on a unified return period, and the method comprises the steps: building a unified flow-area-return period relation of a region, fusing the information of a reference station and a plurality of survey sections, breaking through the limitation that the areas of single stations must be similar, and achieving the robust extension of a flood law from large and medium watershed to small watershed; a physical mechanism is formed based on regional flood, and the consistency of rules is ensured through multi-frequency data joint calibration; the calculation process only needs the catchment area and the design standard of the target small watershed, does not need to actually measure a rainstorm or flood sequence, is particularly suitable for the grassroots water conservancy department, and is high in practicability and easy to popularize in areas with similar climate and underlying surface conditions.

The invention discloses an end-of-flood water storage method and system based on reservoir area temporary inundation risk control, and relates to the technical field of hydropower dispatching big data acquisition and processing. The method comprises the following steps: constructing an early-stage accumulated rainfall sample set, a forecast in-storage peak sample set in an effective forecast period and an actual in-storage peak sample set; calculating an in-storage peak flow forecasting error, and generating an in-storage peak forecasting error sample set according to early-stage rainfall magnitude grouping; analyzing an error distribution rule of reservoir entry peak flow prediction in the effective prediction period, and determining a prediction error estimation function; calculating the highest dam front water level which does not increase reservoir area submerging and corresponds to different-frequency dam site design flood; and calculating the estimated value of the current forecast reservoir entry peak value after the maximum and small error is considered, comparing the corresponding highest pre-dam water level without increasing reservoir area submerging, judging the submerging risk, and determining a water storage decision. The flood-end water storage method can consider various engineering application targets of flood prevention, power generation, water supply and the like of the hydropower station, and the engineering dispatching mode is reasonably optimized.

The invention discloses a DEM-based determination method for design flood calculation parameters of a Huai Shanghai method, and the method comprises the steps: obtaining a target drainage basin and peripheral DEM data, calculating the water flow direction of each grid through a D8 algorithm, and generating a flow direction grid; determining a main stream position according to the flow direction grid; matching a net rain time period according to the drainage basin area A, and calculating net rain intensity i when net rain in the time period is 20mm; identifying the underlying surface type in combination with a satellite image, and matching the roughness values to form a roughness grid; estimating the flow velocity of each grid through a dynamic wave method; determining an isochrone; constructing an L-B curve and a tau-B curve; and determining core parameters of the Huai Shangshi method. The method has the advantages that the isochrone is determined based on the DEM, the isochrone calculation method is improved, the isochrone determination precision is improved, the L-B curve is reasonably determined, then standard, automatic and high-precision acquisition of seven core parameters of the Huai Shangzhou method is achieved, and the parameter determination efficiency and quality are improved.